Crossword Genius

Work in co-operative (5)

Ross

I believe the answer is:

opera

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'work' is the definition.
(musical work)

I don't understand the rest of the clue.

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(Other definitions for opera that I've seen before include "Lohengrin, say" , "Macbeth for one" , "art form" , "musical presentation" , "Billy Budd, for instance" .)

I've seen this clue in The Sun.
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